For most skillion roofs the amount of air movement in the roof cavity, although limited, is sufficient to remove small amounts of vapour. The trick is to keep those amounts of water vapour small.
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Green roofs are slowly breaking into the New Zealand market. Some of the issues and cost benefits are discussed here.
Cost considerations often drive choices when building a property, but thinking more broadly from project design to material specification can be worth its weight in gold.
A new solar collector system, being developed at the University of Waikato, integrates neatly into standard roofing iron and can generate both electricity and heat.